Add and Remove MS-SPRing and SNCP Nodes

Note The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration. Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's path protection feature, which may be used in any topological network configuration. Cisco does not recommend using its path protection feature in any particular topological network configuration.

Caution Adding an MS-SPRing node can be service affecting and should be performed during a maintenance window.

Step 1 Draw a diagram of the MS-SPRing where you will add the node. In the diagram, identify the east and west MS-SPRing STM-N trunk (span) cards that will connect to the new node. This information is essential to complete this procedure without error. Figure 16-1 shows a drawing of a three-node, two-fiber MS-SPRing that uses Slots 5 and 12 for the MS-SPRing trunk cards. The dashed arrow shows the new fiber connections that will be made to add the fourth node to the MS-SPRing.

Figure 16-2 shows a sample drawing of a four-fiber MS-SPRing. The dashed arrow shows the new fiber connections that will be made to add the fourth node. For four-fiber MS-SPRings, two fiber sets will be reconnected, the working fiber and the protect fiber.

Step 5 Check to see if the new node IP address is on the same subnet as other nodes in the network. If two or more PCs are directly connected to different nodes that belong to the same subnet and Craft Access Only is not checked under Gateway Settings, add static routes on the gateway ONS 15454 SDH nodes, using the following settings:

Step 12 Click the Alarms tab. Verify that no critical or major alarms are present, nor any facility alarms, such as LOS, LOF, AIS-L, SF, and SD. If trouble is indicated (for example, a major alarm exists), resolve the problem before proceeding. See Chapter 9, "Manage Alarms" or, if necessary, refer to the Cisco ONS 15454 SDH Troubleshooting Guide.

Step 19 Click the Alarms tab. If unexpected critical or major alarms appear, resolve them before you continue. If necessary, refer to the alarm troubleshooting procedures in the Cisco ONS 15454 SDH Troubleshooting Guide.

Step 20 Following the diagram created in Step 1, remove the fiber connections from the two nodes that will connect to the new node.

a. Remove the west fiber from the node that will connect to the east port of the new node. In the Figure 16-1 example, this is Node 1/Slot 5, and in Figure 16-2 this is Node 3, Slots 5 and 6.

b. Remove the east fiber from the node that will connect to the west port of the new node. In the Figure 16-1 example, this is Node 3/Slot 12, and in Figure 16-2 this is Node 1, Slots 12 and 13.

Step 21 Connect fibers from the adjacent nodes to the new node following the diagram created in Step 1. Connect the west port to the east port and the east port to the west port. For 4-fiber MS-SPRings, connect the protect fibers.

Step 22 Display the newly added node in node view.

Step 23 Click the Provisioning > MS-SPRing tabs.

Step 24 Click Ring Map. Verify that the new node appears on the Ring Map with the other MS-SPRing nodes, then click OK.

Step 25 From the View menu, choose Go to Network View and check the following:

a. Click the Provisioning > MS-SPRing tabs. Verify that the new node appears in the Node column.

If the new node does not appear under the Node column, or if MS-SPRing alarms appear, log into the new node and verify that the MS-SPRing is provisioned on it correctly with the information from Steps 9 and 10. If the node still does not appear, or if alarms persist, refer to the Cisco ONS 15454 SDH Troubleshooting Guide.

Step 26 Click the Circuits tab. Wait until all the circuits are discovered. The circuits that pass through the new node will be shown as incomplete.

Step 27 In network view, right-click the new node and choose Update Circuits With The New Node from the shortcut menu. Verify that the number of updated circuits that appear in the dialog box is correct.

Step 1 From the View menu, choose Go to Network View. Verify that all MS-SPRing or SNCP ring spans on the network map are green.

Step 2 Click the Alarms tab. Verify that no critical or major alarms are present, nor any facility alarms, such as LOS, LOF, AIS-L, SF, and SD. In an MS-SPRing, these facility conditions might be reported as minor alarms. Make sure the Filter button in the lower right corner of the window is off (not indented).

Step 3 Click the Conditions tab and click Retrieve Conditions. Verify that no ring switches are active. Make sure the Filter button in the lower right corner of the window is off (not indented).

Step 4 Return to the originating procedure (NTP).

DLP-D242 Create an MS-SPRing on a Single Node

Purpose

This task creates an MS-SPRing on a single node. The task is used when you add a node to an existing MS-SPRing or when you delete and then recreate an MS-SPRing temporarily from one node.

Caution Traffic is not protected during a Force Ring protection switch.

Step 1 From the View menu, choose Go to Network View.

Step 2 Click the Provisioning > MS-SPRing tabs.

Step 3 Click Edit.

Step 4 To apply a Force switch to the west line:

a. Right-click the west MS-SPRing port where you want to switch the MS-SPRing traffic and choose Set West Protection Operation (Figure 16-3).

Note If node icons overlap, drag and drop the icons to a new location. You can also return to network view and change the positions of the network node icons, because MS-SPRing node icons are based on the network view node icon positions.

Note For two-fiber MS-SPRings, the squares on the node icons represent the MS-SPRing working and protect channels. You can right-click either channel. For four-fiber MS-SPRings, the squares represent ports. Right-click either working port.

Figure 16-3 Invoking a Protection Operation on a Three-Node MS-SPRing

b. In the Set West Protection Operation choose FORCE RING from the drop-down menu. Click OK.

c. Click Yes in the two Confirm MS-SPRing Operation dialog boxes that appear.

On the network graphic, an F appears on the working MS-SPRing channel where you invoked the protection switch. The span lines change color to reflect the forced traffic. Green span lines indicate the new MS-SPRing path, and the lines between the protection switch are purple.

Performing a Force switch generates several conditions including FORCED-REQ-RING, FORCED-REQ-RING, and WKSWPR.

Step 5 To apply a Force switch to the east line:

a. Right-click the east MS-SPRing port and choose Set East Protection Operation.

Note If node icons overlap, drag and drop the icons to a new location. You can also return to network view and change the positions of the network node icons because MS-SPRing node icons are based on the network view node icon positions.

Note For two-fiber MS-SPRings, the squares on the node icons represent the MS-SPRing working and protect channels. You can right-click either channel. For four-fiber MS-SPRings, the squares represent ports. Right-click either working port.

b. In the Set East Protection Operation dialog box, choose FORCE RING from the drop-down menu. Click OK.

c. Click Yes in the two Confirm MS-SPRing Operation dialog boxes that appear.

On the network graphic, an F appears on the working MS-SPRing channel where you invoked the protection switch. The span lines change color to reflect the forced traffic. Green span lines indicate the new MS-SPRing path, and the lines between the protection switch are purple.

Performing a Force switch generates several conditions including FORCED-REQ-RING, FORCED-REQ-RING, and WKSWPR.

Caution The following procedure minimizes traffic outages during node removals. You will delete all circuits that originate and terminate on the node that will be removed. You will also verify that they do not enter and exit the node on different VC4s and/or VC3s or VC12. If they do, you will delete and recreate the circuits, and traffic will be lost during this time.

Caution If you remove a node that is the only building integrated timing supply (BITS) timing source for the ring, you also remove the only source of synchronization for all the nodes in that ring. Circuits that leave the ring to connect to other networks synchronized to a Stratum 1 clock will experience a high level of pointer adjustments, which might adversely affect traffic performance.

Step 5 From the View menu, choose Go to Other Node. Choose the node that you will remove and click OK.

Step 6 Click the Circuits tab. If the Scope setting is set to Network, choose Node from the Scope drop-down menu. Make sure the Filter button is off (not indented) to ensure that all circuits are visible.

Step 10 Referring to the diagram created in Step 1, complete the "DLP-D303 Initiate an MS-SPRing Force Ring Switch" task at each node that connects to the target (removal) node to force traffic away from it. You must perform a Force switch at each port connected to the target node. For example, in Figure 16-4, you would perform a Force switch on the east port of Node 3 and the west port of Node 1.

Step 11 Click the Alarms tab. If unexpected critical or major alarms appear, resolve them before you continue. If necessary, refer to the alarm troubleshooting procedures in the Cisco ONS 15454 SDH Troubleshooting Guide.

Step 12 Remove the fiber connections between the target node and the two neighboring nodes.

Step 13 Reconnect the fiber of the two neighboring nodes directly, west port to east port. For example, in Figure 16-4, you would connect the east port of Node 3 (Slot 12) to the west port of Node 1 (slot 5).

Step 15 If you delete a node that was in a login node group, you will see incomplete circuits for that node in the CTC network view. (Although it is no longer part of the ring, the removed node still reports to CTC until it is no longer in a login node group.) Delete the node from the login node group:

a. From the CTC Edit menu, choose Preferences.

b. In the Preferences dialog box, click the Login Node Groups tab.

c. Click the login node group tab containing the node you want to remove.

d. Click the node you want to remove, then click Remove.

e. Click OK.

Step 16 Click the History tab. Verify that the MS-SPRing_RESYNC condition appears for every node in the MS-SPRing.

c. If no node in the reduced ring can be used as a BITS source, choose one node to be your internal timing source. Set that node's Timing Mode to External, set the BITS-1 and BITS-2 BITS In State to OOS, and set the NE Reference to Internal. Then, choose line timing for all other nodes in the ring. This forces the first node to be their primary timing source. (See the "DLP-D157 Change the Node Timing Source" task on page 12-23.)

Note This type of timing conforms to Stratum 3 requirements and is not considered optimal.

Step 5 If the removed node was not the only BITS timing source, provision the adjacent nodes to line timing using SDH links (east and west) as timing sources, traceable to the node with external BITS timing. See the "NTP-D28 Set Up Timing" procedure on page 4-20.

Step 6 Return to your originating procedure (NTP).

DLP-D304 Verify MS-SPRing Pass-Through Circuits

Purpose

This task verifies that circuits passing through a node that will be removed from an MS-SPRing enter and exit the node on the same VC4 and/or VC3 or VC12.

Step 1 In the CTC Circuits window, choose a circuit that passes through the MS-SPRing node that will be removed and click Edit.

Step 2 In the Edit Circuits window, check Show Detailed Map.

Step 3 Verify that the circuits have the same east and west port VC4, VC3, VC12 mapping. For example, if the circuit west port mapping is s5/p1/V1 (Slot 5, Port 1, VC4 1), verify that the east port is also VC4 1. If the circuit has different east/west VC4s and/or VC3 or VC12s, write down the name of the circuit. Figure 16-5 shows a circuit passing through a node (doc-124) on the same VC4 (VC4 2).

Figure 16-5 Verifying Pass-Through VC4s

Step 4 Repeat Steps 1 to 3 for each circuit that appears in the Circuits tab.

Step 1 In network view, double-click a MS-SPRing node with OC48 LS/STM16 LH AS trunk cards that will be reconnected after a MS-SPRing node removal.

Step 2 Double-click one OC48 LS/STM16 LH AS MS-SPR trunk card.

Step 3 Click the Provisioning > Line tab.

Step 4 Record on paper the byte that appears in the MS-SPR Ext Byte column.

Step 5 Repeat Steps 2 and 4 for the second OC48 LS/STM16 LH AS trunk card

Step 6 If the node at the other end of the new span contains OC48 LS/STM16 LH AS trunk cards, repeat Steps 1 and 5 at the node. If it does not have OC48 LS/STM16 LH AS cards, their trunk cards are mapped to the K3 extension byte. Continue with Step 7.

Step 7 If the trunk cards on each end of the new span are mapped to the same MS-SPRing extension byte, continue with Step 6. If they are not the same, remap the extension byte of the trunk cards at one of the nodes. See the "DLP-D89 Remap the K3 Byte" task on page 6-17.

Step 8 Return to your originating procedure (NTP).

DLP-D196 Delete an MS-SPRing from a Single Node

Purpose

This task deletes an MS-SPRing from a node after you remove the node from an MS-SPRing.

Step 2 Log into an existing node in the SNCP where you want to add a node. See the "DLP-D60 Log into CTC" task on page 3-23 for instructions. In order to have CTC visibility to the new node after it is added, you must be an authorized user on the node and you must have IP connectivity to the node.

Step 4 Verify the card installation on the new node. See the "NTP-D24 Verify Card Installation" procedure on page 4-2. Check that the STM-N cards that will serve as the SNCP trunk (span) cards match the SNCP optical rate of the trunk cards to which the new node will be connected. For example, if the adjacent nodes have STM-16 trunk cards, the new node must have STM-16 cards installed. If the STM-N cards are not installed or the rate does not match the rate of the adjacent node trunk cards, complete the "NTP-D16 Install the STM-N Cards" procedure on page 2-12 to install them.

Step 5 Verify that fiber is available to connect the new node to the existing nodes.

Step 9 Click the Alarms tab. Verify that no critical or major alarms are present, nor any facility alarms, such as LOS, LOF, AIS-L, SF, and SD. If trouble is indicated (for example, a major alarm exists), resolve the problem before proceeding. See Chapter 9, "Manage Alarms" or, if necessary, refer to the Cisco ONS 15454 SDH Troubleshooting Guide.

Step 14 Two nodes will connect directly to the new node; remove their fiber connections:

a. Remove the east fiber connection from the node that will connect to the west port of the new node.

b. Remove the west fiber connection from the node that will connect to the east port of the new node.

Step 15 Replace the removed fibers with the fibers that are connected to the new node.

Step 16 Log out of CTC and log back into a node in the network.

Step 17 From the View menu, choose Go to Network View to display the SNCP nodes. The new node should appear in the network map. Wait for a few minutes to allow all the nodes to appear.

Step 18 Click the Circuits tab and wait for all the circuits to appear, including spans. Count the number of incomplete circuits.

Step 19 In the network view, right-click the new node and choose Update Circuits With New Node from the shortcut menu. Wait for the confirmation dialog box to appear. Verify that the number of updated circuits that appears in the dialog box is correct.

Note If the circuits take more than a minute to appear, log out, then log back in.

Step 20 Click the Circuits tab and verify that no incomplete circuits appear.

Caution The following procedure minimizes traffic outages during node removals.

Caution If you remove a node that is the only BITS timing source for the ring, you also remove the only source of synchronization for all the nodes in that ring. Circuits that connect to other networks which are synchronized to a Stratum 1 clock will experience a high level of pointer adjustments, which might adversely affect customer service.

Step 1 Draw a diagram of the SNCP ring where you will remove the node. In the diagram, identify the following:

•The node that is connected through its west port to the node that will be removed.

•The node that is connected through its east port to the node that will be removed.

Step 7 Remove all fiber connections between the node being removed and the two neighboring nodes.

Step 8 Reconnect the fiber of the two neighboring nodes directly, west port to east port.

Step 9 If you delete a node that was in a login node group, you will see incomplete circuits for that node in the CTC network view. (Although it is no longer part of the ring, the removed node still reports to CTC until it is no longer in a login node group.) Delete the node from the login node group:

a. From the CTC Edit menu, choose Preferences.

b. In the Preferences dialog box, click the Login Node Groups tab.

c. Click the login node group tab containing the node you want to remove.

Step 11 Log into each newly connected node and open the Alarms tab. Verify that the span cards are free of alarms. Resolve any alarms before proceeding. Refer to the Cisco ONS 15454 SDH Troubleshooting Guide.